Without certain relevant information, all of these prices are useless when determining how well someone did, either alone or relative to yourself and your own deal. Posters must include such information as private seller or dealer, and if dealer, Certified Pre-Owned or not. You also need to specify where in the world you live, because geography also plays a significant role in the market price of any given vehicle. So that $42k could have been a shitty deal, or a fantastic one. It all depends. Without the aforementioned info, it's just a meaningless number.

Absolutely. Another important piece of info is whether you had a trade-in and how much they gave you for it.